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Effect of quaternary basicity on softening-melting behavior of primary slag based on magnesium flux pellet

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Journal of Iron and Steel Research International 2022年第8期29卷 1185-1193页

作者： kai-kai Bai Hai-bin Zuo Wen-guo Liu Jing-song Wang Jian-sheng Chen Qing-guo Xue State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

It is generally accepted that the softening-melting properties of ferrous burden play a vital role in optimizing the shape and position of cohesive *** effect of quaternary basicity and atmosphere on softening,melting and permeation temperatures of primary slag based on magnesium flux pellet was investigated by visualization *** mechanisms were analyzed utilizing thermodynamic calculation,X-ray diffraction analysis and electron probe *** results indicated that the softening and melting temperatures of oxide samples increased by approximately 120℃with increasing quaternary basicity from 0.3 to 1.2 owing to the formation of slag phases with high melting point and solid ***,the difference between softening and melting temperatures decreased from 21 to 11℃.The permeation temperature was not affected by the quaternary basicity and fluctuated around a level of 1250 C,given that the permeation temperature depends on the wettability between slag and coke *** the other hand,as the ratios of CO/CO_(2) varied from 3/7 to 7/3,there were no significant differences in either the softening or melting temperatures,whereas the permeation temperature was increased from 1239 to 1271℃ since the reduction of FeO-bearing phases to solid Fe could decrease the wettability between slag and coke bed.

关键词： Magnesium flux pellet Primary slag Quaternary basicity CO/CO_(2)ratio Cohesive zone Softening-melting Behavior

Spatial distribution of bacterial community in EGSB reactor treating synthetic sulfate-containing wastewater at low organic loading rate

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Chinese Science Bulletin 2014年第1期59卷 54-61页

作者： kai Zhang Xiaolei Cao Yuxing sheng Hongbin Cao National Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Graduate University of Chinese Academy of Sciences

Given that the consumption of organic substances entails costly biodesulfurization,the characteristics of the bacterial community in a reactor should be determined to increase the desulfurizing rate under low organic loading *** this study,the bacterial community distribution in the expanded granular sludge bed reactor used to treat sulfate-containing wastewater with low organic loading rate was determined by polymerase chain reaction-denaturing gradient gel electrophoresis(PCRDGGE)and 16S rDNA clone library *** results showed that the predominant bacteria were stable and accounted for*90%sulfate removal *** in band positions and intensities indicated that the distribution and abundance of bacteria were affected by their positions in the *** bands were identified in the bacterial community comprising Desulfovibrio,Desulfomicrobium,Thiomonas,Acinetobacter,Bacteroidetes,and *** functions in the reactor were also *** possible links between the functional and microbial responses were also investigated based on the characteristic and spatial distribution of each bacterium in consortium.

关键词： EGSB反应器有机负荷率硫酸盐废水细菌群落空间分布合成废水 PCR-DGGE 膨胀颗粒污泥床反应器

Phosphoryl choline-grafted water-soluble carbon nanotube

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Chinese Chemical Letters 2008年第1期19卷 105-109页

作者： Tao Zhang kai Xi Min Gu Zheng sheng Jiang Department of Material Science and Engineering Nanjing University Nanjing 210093 China College of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China Physics Department Nanjing University Nanjing 210093 China

Water-soluble property is the precondition of biomedical evaluation and application of carbon nanotube （CNT）. Novel water- soluble CNT was synthesized in this letter by grafting phosphoryl choline （PC） onto multi-wall CNTs. Utilizing FTIR, XPS, TGA and TEM, the title CNTs were characterized and it was found that the target products could facilely dissolve in water. 2007 Tao Zhang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Carbon nanotube Water-soluble Phosphoryl choline

SVM based layout retargeting for fast and regularized inverse lithography

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Journal of Zhejiang University-Science C(Computers and Electronics) 2014年第5期15卷 390-400页

作者： kai-sheng LUO Zheng SHI Xiao-lang YAN Zhen GENG Institute of VLSI Design Zhejiang University

Inverse lithography technology(ILT),also known as pixel-based optical proximity correction(PB-OPC),has shown promising capability in pushing the current 193 nm lithography to its *** treating the mask optimization process as an inverse problem in lithography,ILT provides a more complete exploration of the solution space and better pattern fidelity than the traditional edge-based ***,the existing methods of ILT are extremely time-consuming due to the slow convergence of the optimization *** address this issue,in this paper we propose a support vector machine(SVM)based layout retargeting method for ILT,which is designed to generate a good initial input mask for the optimization process and promote the convergence *** by optimized masks of training layouts generated by conventional ILT,SVM models are learned and used to predict the initial pixel values in the‘undefined areas’of the new *** this process,an initial input mask close to the final optimized mask of the new layout is generated,which reduces iterations needed in the following optimization *** is another critical issue in ILT;however,the mask generated by our layout retargeting method is quite irregular due to the prediction inaccuracy of the SVM *** compensate for this drawback,a spatial filter is employed to regularize the retargeted mask for complexity *** implemented our layout retargeting method with a regularized level-set based ILT(LSB-ILT)algorithm under partially coherent illumination *** results show that with an initial input mask generated by our layout retargeting method,the number of iterations needed in the optimization process and runtime of the whole process in ILT are reduced by 70.8%and 69.0%,respectively.

关键词： Inverse lithography technology Optical proximity correction Layout retargeting Support vector machine

Orthogonal Stacked Spectral Coding Labels for Fast Packets Routing over Optical MPLS Network

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Journal of Electronic Science and Technology 2015年第2期13卷 130-134页

作者： kai-sheng Chen Chao-Chin Yang Jen-Fa Huang Institute of Computer and Communications Department of Electrical EngineeringNational Chen-Kung University Department of Electro-Optical Engineering Kun Shan University

Multi-protocol label switching（MPLS） has the advantage of high efficiency in the second layer, which improves the performance of data packets routing. In this paper, a new structure to implement optical MPLS is proposed. We construct a code family for spectral-amplitude coding（SAC） labels in the optical MPLS networks. SAC labels are suitable for optical packet switching because they can be constructed and recognized quickly at each router. We use the label stacking to provide hierarchical routing to avoid swapping labels at each forwarding node and reduce system complexity. However, the phase-induced intensity noise（PIIN） appears due to the incoherent property of the light source when the stacked labels set makes the correlation decoding with the local node label,which degrades system performance.

关键词： label hierarchical switching quickly routing decoding forwarding packet matches router

Chilling Injury, Physicochemical Properties, and Antioxidant Enzyme Activities of Red Pitahaya (Hylocereus polyrhizus) Fruits under Cold Storage Stress

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Phyton-International Journal of Experimental Botany 2021年第1期90卷 291-305页

作者： kai sheng Saichao Wei Jun Mei Jing Xie College of Food Science and Technology Shanghai Ocean UniversityShanghai201306China National Experimental Teaching Demonstration Center for Food Science and Engineering Shanghai Ocean University Shanghai201306China Shanghai Engineering Research Center of Aquatic Product Processing and Preservation Shanghai201306China Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation Shanghai201306China

Low-temperature storage is extensively used to optimize the postharvest life of various fresh ***,red pitahaya(Hylocereus polyrhizus)fruits are sensitive to chilling injury(CI),which leads to the limitation of low-temperature *** this study,red pitahaya fruits were stored at 2,4,6,8,and 10℃,respectively,for 27 days to determine the appropriate storage *** the storage of red pitahaya fruits,storage at 8℃ was more effective in suppressing decay and maintaining quality than other low ***(2,4,and 6℃)storage decreased weight loss(WL)and maintained higher content of titratable acidity(TA),soluble sugars(SS),and total phenolics(TP)but different degrees of CI were *** CI was observed at 8℃ and 10℃.Red pitahay as stored at 8 and 10℃ were associated with better color evaluation,lower electrolyte leakage(EL),respiration rate,and lipoxygenase(LOX)activity,and higher fruit firmness,superoxide dismutase(SOD)activity,and catalase(CAT)***,higher storage temperature(10℃)resulted in higher metabolic activity leading to lower quality and antioxidant capacities compared with 8℃.Therefore,our results demonstrated that red pitahaya stored at 8℃ exhibited a protective effect on fruit quality and resisted CI development during storage.

关键词： Red pitahaya quality low temperature chilling injury

Existence patterns of Dy in β-NiAl from first-principles calculations

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Rare Metals 2016年第4期35卷 356-360页

作者： Tian Zhang Hong-Bo Guo sheng-kai Gong Hui-Bin Xu School of Materials Science and Engineering Beihang University

Intermetallic compound β-NiA1 is a promising material in high temperature applications due to its high melting temperature, high strength, low density, and good oxidation resistance. However, its application remains limited because of its relatively poor cyclic oxidation resistance. Addition of reactive element （RE） Dy can improve the cyclic oxidation of NiA1 alloys significantly. However, the mechanism of Dy addition is not clear. Even the existence pattern of Dy in NiA1 is unspecified. Therefore, in the present study, the impurity formation energies of Dy in stoichiometric NiA1, Ni-rich, and Al-rich NiA1 for the substitution cases were studied by first-principles density functional theory. The results show that Dy could hardly substitute for either Ni or A1 atoms in NiA1. However, calculations for dissolution energies show that Dy could be easily dissolved in AI vacancies in all three types of NiA1, which provides a new existence pattern of Dy in NiA1 beyond experimental detection.

关键词： Existence pattern Dy A1 vacancies First-principles

Technological innovations of electric arc furnace bottom-blowing in China

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Journal of Iron and Steel Research International 2019年第9期26卷 909-916页

作者： Guang-sheng Wei Rong Zhu Yun Wang Xue-tao Wu kai Dong School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Research Center of Special Melting and Preparation of High-End Metal Materials University of Science and Technology BeijingBeijing 100083China

Nowadays, in China, the bottom-blowing technique plays an important role in accelerating the molten bath stirring and promoting the metallurgical reactions in electric arc furnace (EAF) steelmaking. The innovations of bottom-blowing technologies in EAF steelmaking were reviewed. The optimized bottom-blowing arrangement in EAF based on the furnace structure and the position of electrodes was introduced, and the fluid flow characteristics of EAF molten bath with bottomblowing were analyzed. Furthermore, bottom-blowing CO2 in EAF can facilitate the carbon-oxygen reaction reaching equilibrium and decrease the content of nitrogen in molten steel due to its special metallurgical properties. Pulsating bottom-blowing in EAF can effectively improve the molten bath stirring through the action of the unsteady bottom blowing gas streams, which could make the fluid flow field more disorderly than the steady bottom-blowing. And submerged O2 injection with CO2 in EAF can noticeably strengthen the EAF molten bath stirring, increase the production efficiency and improve the molten steel quality.

关键词： Electric arc furnace Bottom-blowing CO2 Pulsating bottom-blowing EAF combined blowing technology Submerged O2 injection with CO2

Curing kinetics and plugging mechanism of high strength curable resin plugging material

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Petroleum Science 2024年第5期21卷 3446-3463页

作者： Jing-Bin Yang Ying-Rui Bai Jin-sheng Sun kai-He Lv School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina CNPC Engineering Technology R&D Company Limited Beijing102206China

Lost circulation, a recurring peril during drilling operations, entails substantial loss of drilling fluid and dire consequences upon its infiltration into the formation. As drilling depth escalates, the formation temperature and pressure intensify, imposing exacting demands on plug materials. In this study, a kind of controllable curing resin with dense cross-network structure was prepared by the method of solution stepwise ring-opening polymerization. The resin plugging material investigated in this study is a continuous phase material that offers effortless injection, robust filling capabilities, exceptional retention, and underground curing or crosslinking with high strength. Its versatility is not constrained by fracture-cavity lose channels, making it suitable for fulfilling the essential needs of various fracture-cavity combinations when plugging fracture-cavity carbonate rocks. Notably, the curing duration can be fine-tuned within the span of 3-7 h, catering to the plugging of drilling fluid losing of diverse fracture dimensions. Experimental scrutiny encompassed the rheological properties and curing behavior of the resin plugging system, unraveling the intricacies of the curing process and establishing a cogent kinetic model. The experimental results show that the urea-formaldehyde resin plugging material has a tight chain or network structure. When the concentration of the urea-formaldehyde resin plugging system solution remains below 30%, the viscosity clocks in at a meager 10 mPa·s. Optimum curing transpires at 60℃, showcasing impressive resilience to saline conditions. Remarkably, when immersed in a composite saltwater environment containing 50000 mg/L NaCl and 100000 mg/L CaCl_(2), the urea-formaldehyde resin consolidates into an even more compact network structure, culminating in an outstanding compressive strength of 41.5 MPa. Through resolving the correlation between conversion and the apparent activation energy of the non-isothermal DSC curing reac

关键词： Urea-formaldehyde resin Rheological property Curing property Curing kinetics Plugging mechanism